Math Lesson ( Week 18 ) : Topic12 - Geometry & Tropic 13 - Counting Money

http://quizlet.com/Paulina_Chang/folders/math-math-envision

Week 16 : Jan 5 - Jan 9
Week 17: Jan 12 - Jan 16
Week 18: Jan 19 - Jan 23
Week 19: Jan 26 - 30

Math Lesson ( Week 16 - 17 ) : Topic 9 : Subtracting Two - Digit Numbers